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Discussion Starter #1
OK so I've only had this problem recently but i figured ill ask around. So my sami has been running kind of crappy lately. did some investigating only to find out that the previous owner had replaced mechanical fuel pump with electrical. wouldst be a problem if he didn't replace it buy pulling the fuel filter all together and putting the new pump in its place. i put a new filter inline with the pump and it seemed to run ok. but then today i tried to drive it around the block and it completely stalled out on me. couldn't start it for about a min or two. had no starter noise but still had power seemed as if it just would turn the engine. now when its on it idles but barley and will die sometimes or struggle to stay up. need some help on this one please.
 

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my E-pump (mr. gasket cheapy) did this recently as well but i have my filter in place, i thought the tank ran out. checked that had a bit in there yet, checked the filter was a little cruddy but still clear, and the went to the pump. I heard it whirring but popped off the line to the carb and no fuel was pumping out. took off the pump and blew into its filter and cleaned it even tho i couldnt see anything, still no luck so i just sat there for a few mins with the pump on and the hose in a coffee can, sire enough it started pumping gas, idk if it was vapor locked somehow or what but it was full of air. my symptoms was the fuel bowl running outta gas and get up to 3rd gear and itd be empty again so it died block to block. i would try bleeding the fuel lines see if it helps any
 

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2 common things can cause that problem, air leak before the pump, and a faulty non return valve in the pump that allows fuel to drain back to the tank when car is off. Some of the crappy electric pumps can't even pressurise against a head of air in the line to push fuel thru to the carb.
Another problem I have seen is people ripping the fuel filter out and putting an electrical pump in just like the previous owner has done, and they have just left the mech pump in there figuring the electric will push the fuel thru it. Well, they will initially but the mech pump internals collapse (I wonder why they replaced it with an electric one in the first place :huh:) creating a big resistance for the new pump which leads to fuel starvation.

Just check the old mech pump isn't still in circuit and has been bypassed. Best thing if you stick with electric is to rully remove the pump and put a blanking plate over the hole (or be really rough, cut the actuating lever off the pump near the case, clean all the filings out of it you just made and reinstall it to block the hole). This will stop the pump operating and at least prevent further engine damage if it fails mechanically internally (see my comment about why was it replaced in the first instance)

Another thing is a faulty or blocked tank inlet pipe, some have a filter on it as well that blocks, giving exactly the same symptoms as a faulty fuel pump. If you aren't getting fuel to the pump, it ain't gonna work. Get a bit of hose, put it on the line to the tank and blow (don't suck, unless you really like petrol) and get someone to put their ear to the filler with the cap off obviously and see if they can hear air bubbling into the tank. No bubbling, blocked line.
 

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Discussion Starter #4
luckily the mechanical pump has already been removd, i will definently have to try to see if air in the system is causing the problem. hoping its something small. otherwise im gonna have to either get the carb jetted or take out the filter till i can figure out what the prob is.
 

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if its been running ok and only started playing up recently, then jetting is not the issue. That engine has run for how many years on those jets, why should it suddenly need different ones? You have a fuel supply issue (and possible dirt in the carb but we will tackle that later) Did you flush the filter before installing it? and the line once you had installed the filter? or did you just cut the pipe and push it onto the filter and clamp it up? its quite possible you have dislodged something, or gotten a bit of rubbish up the line and into the carb causing a blockage.

Easiest test of the whole system is to take the line off at the carb, put it into a clean container and turn the key on and see if you get fuel flowing. If you do, then its a blockage in the carb thats causing the problem. Check the fuel in the container after its settled for dirt or water, both will be obvious if there.

If no fuel flow, remove the filter and re-check. Its possible the filter is the issue. (since it only started playing up after you installed the filter, thats a good place to start)
 

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Discussion Starter #6
ill give those a try. seems as if issue only started after i installed filter. filter was new when installed, and i didnt think to check the lines after installed. good chance there is something in the lines or possibly just air. ill test it this week and post my results. thank you guys.
 

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it could also be the filter itself, some are far too fine for a low pressure system.
 
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